#!/usr/bin/python
# -*- coding: utf-8 -*-

import os
import sys

if __name__ == '__main__':
	args = sys.argv
	
	if len(args) != 3:
		print 'ERRO: need arguments,(source_dir newname_prevfix)'
		exit()


	s_dir = args[1];
	prevfix = args[2];	
	if os.path.isdir(s_dir):
		count = 1
		for sfile in os.listdir(s_dir):
			if os.path.isfile(s_dir + os.sep + sfile):
				(file_name, file_ext) = os.path.splitext(sfile)
				if file_ext == '.jpg':
					os.rename(s_dir + os.sep + sfile, s_dir + os.sep + prevfix + str(count) + file_ext)
					count = count + 1
	
